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Title: Unravelling the elusive antiferromagnetic order in wurtzite and zinc blende CoO polymorph nanoparticles
Author: Roca, Alejandro G.
Golosovsky, Igor V.
Winkler, Elin
López-Ortega, Alberto
Estrader i Bofarull, Marta
Zysler, Roberto D.
Baró, Maria Dolors
Nogués, Josep
Keywords: Ferromagnetisme
Issue Date: 26-Feb-2018
Publisher: Wiley-VCH
Abstract: Although cubic rock salt‐CoO has been extensively studied, the magnetic properties of the main nanoscale CoO polymorphs (hexagonal wurtzite and cubic zinc blende structures) are rather poorly understood. Here, a detailed magnetic and neutron diffraction study on zinc blende and wurtzite CoO nanoparticles is presented. The zinc blende‐CoO phase is antiferromagnetic with a 3rd type structure in a face‐centered cubic lattice and a Néel temperature of TN (zinc‐blende) ≈225 K. Wurtzite‐CoO also presents an antiferromagnetic order, TN (wurtzite) ≈109 K, although much more complex, with a 2nd type order along the c‐axis but an incommensurate order along the y‐axis. Importantly, the overall magnetic properties are overwhelmed by the uncompensated spins, which confer the system a ferromagnetic‐like behavior even at room temperature.
Note: Versió postprint del document publicat a:
It is part of: Small, 2018, vol. 14, num. 15, p. 1703963
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ISSN: 1613-6810
Appears in Collections:Articles publicats en revistes (Química Inorgànica i Orgànica)

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